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T-Connected Autotransformer Based 36-Pulse AC-DC Converter for Power Quality Improvement

100%

Abdollahi R.

Przegląd Elektrotechniczny

2012

tom R. 88, nr 2

321-327

This paper presents the design and analysis of a T-Connected autotransformer based 36-pulse ac-dc converter which supplies direct torque controlled induction motor drives (DTCIMD’s) in order to have better power quality conditions at the point of common coupling. The proposed converter output voltage is accomplished via two paralleled 18-pulse ac-dc converters. An autotransformer is designed to supply the rectifiers. The T-connected autotransformer makes use of only two single-phase transformers, resulting in savings in space, volume, weight, and, finally, the cost of the drive. The design procedure of magnetics is in a way such that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. The aforementioned structure improves power quality criteria at ac mains and makes them consistent with the IEEE-519 standard requirements for varying loads. Furthermore, near unity power factor is obtained for a wide range of DTCIMD operation. A comparison is made between 6-pulse and proposed converters from view point of power quality indices. Results show that input current total harmonic distortion (THD) is less than 4% for the proposed topology at variable loads.

W pracy zaprezentowano projekt i analizę 36-pulsowego przekształtnika AD-DC bazującego na autotransformatorze typu T i zasilającego bezpośrednio silnik indukcyjny ze sterowanym momentem obrotowym DTCIMD. Układ wykorzystuje tylko dwa jednofazowe transformatory. Układ zapewnia odpowiednią jakość energii zgodnie z normą IEEE-519. Porównano układ z układem 6-pulsowym.

Technical and economical comparison of different autotransformer based 36 pulse AC-DC Converters

84%

Abdollahi R.

Journal of Power Technologies

2019

tom Vol. 99, nr 4

281--288

Three-phase multipulse ac–dc converters (MPC) are being developed to improve power quality to reduce harmonics in ac mains and ripples in dc output. This study, based on technical and economic factors, compares different autotransformer based 36 pulse AC-DC Converters. This paper presents a comparison of tapped delta, polygon and T connected autotransformer based 36-pulse AC-DC converters. These converters were implemented and simulations were made using Matlab/Simulink software for similar ratings under different load conditions. A set of power quality indices on input ac mains and on a dc bus for a DTCIMD fed from different 36-pulse ac-dc converters is given to compare their performance. The economic comparison of 36 pulse ac–dc converters is based on the apparent power (kVA) ratings of the different autotransformers for 36 pulse AC-DC converters. Also, a prototype is developed and the experimental measurements obtained are presented to validate the feasibility and operability of the 36-pulse AC-DC converter. The 36-pulse AC-DC converter offers a total harmonic distortion of 4% and can operate at near-unity power factor, in compliance with IEEE and IEC standards.

Design and construction of a polygon-connected autotransformer-based 36-pulse AC-DC converter for power quality improvement in retrofit applications

84%

Abdollahi R.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2015

tom Vol. 63, nr 2

353--362

This paper presents the design and analysis of a polygon connected autotransformer based 36-phase AC-DC converter which supplies direct torque controlled induction motor drives (DTCIMD’s) in order to have better power quality conditions at the point of common coupling. The proposed converter output voltage is accomplished via two paralleled eighteen-pulse AC-DC converters each of them consisting of nine-phase diode bridge rectifier. An autotransformer is designed to supply the rectifier. The design procedure of magnetics is in a way such that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. The proposed structure improves power quality criteria at ac mains and makes them consistent with the IEEE-519 standard requirements for varying loads. Furthermore, near unity power factor is obtained for a wide range of DTCIMD operation. A comparison is made between 6-pulse and proposed converters from view point of power quality indices. Results show that input current total harmonic distortion (THD) is less than 4% for the proposed topology at variable loads. A laboratory prototype of the proposed Polygon-Connected autotransformer-based 36-pulse AC-DC converter is developed and test results are presented to validate the developed design procedure and the simulation models of this AC-DC converter under varying loads.